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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4ccebb41ba0338da867f2274aff57c46de71af13c71346d0e1de096b9a937dd9' 
  AND token = 'kAqpHUzAC+7jBVGUpty+X6zSy1OULiuD4pmUdtOBO9Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}